Wood-grinder.



Patented July 2, 1912.

z sHEBTssEBT 1.

P. PRIEM.

WOOD GRINDER. A APPLICATION P ILED JULY 15,1909.

P. PRIBM WOOD GRINDER.

APPLIUATION FILED JULY 15,1909.

`2 SHEETS-SHEET z.

'Pateted July 2, 1912.

#WEA/Taf? PAUL PRIEM ZY JMW w/TNESSES im@ flh all whom# may" concern:

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Tns PATENT oiiilIClio PAUL PRIEM, F HEIDENHEIM-ON-THE-BRENZ, GERMANY.

woon-GRINDER.

nascere.'

specicatio'n of Letters Patent.

Patented July 2, 1912.

Appiication med July 15, 1909. serial no. 507,840.

Be 'it known lthat I, PAUL PRI'EM, a citizen @t Grermany,l residing at Heldenheun-onfaire-Brenna Germany, have invented new and Aaseful.ltn'iprovem'ents in Wood-Grinders, of

which the following is a specication.

My invention relates to wood grinders and" the primary object of my invent-ion is ai provide an efficient automatic feed for "f duid-operated reversible press.

ln wood grinding machines with revershie presses as'. heretofore constructed, where any; attemptV has been made to secure an automaticfeedfof the' wood to the press, the .hopper containing the supply of wood has itself beenY made movable and has in fact constituted a portion of the press, which is directly subjected to the action of the pressure means. ,These 'hoppers from their very nature. cannot hold asutlicient supply of wpod to make the operation of the machine continuous and"interruptions must occur lat short intervals in order that the presser hopper may be recharged. Furthermore it is not possible to lprevent the jamming of the wood in -the hopper and consequently the .feed is not automatic, but

. must be, constantly maintained by an attendant who frequently loosens the jammed Ypieces so that they fall against the grinder. -'These delays materially diminish the capacity and therefore the value ofthe machine. lIt the object of my invention to provide means forautomatically refilling the press from a stationary hopper, which may be of any desired size, so that theoperation of 'the machine may be made substantially'f -con- Utinuous and without interruption or stoppagefor recharging with wood, 'or for dislodging jammed material.

In order that my invention may be clearly understood I will now explain the same l with reference yto the accompanying drawings in which several embodiments are represented diagrammatically by way of ex- 'gare 1 is a vertical sectional -elevation showing one form of wood grinder with sliding pressing-plates; Fig. 2 is a .like view'of a modified form,

the pressing-plates being pivot-ally mounted so as'torock; Fig. -3 is, aglikeview showing parts of another modified-forrtiofmachine,

4several small presses ofthelltype shown in f 'a like w showing .a modification of the Figfull eing provided, whereas Fig. 4 is form illustrated in Fig.`2, Fig. 5 is a like view of part of a wood grinder, the pressing plate being replaced by an elastic steel belt; Fig. 6 is a vertical sectional elevation showing a further modification of the form illust-rated in Fig. 2; and Fig. 7 is a like view showing parts of another modified form of the machine.

Referring to the drawings, in my new. wood grinder the wood is pressed intermittently againstthe grindst-one in wellknown manner by mechanical or hydraulic pressure, etc., the one or more presses e of the machine being connected, however, in

receptacles or hoppers that when a press yrecede's from the grind-stone it is automatically filled `again. The movable part of the press or its driving gear lis reversed automatically or by hand (preferably the former) when it is in definite position. with relation tothe grind-stone, for example in immediate proximity to the same, so that this movable part of thev press returns to its initial position at van accelerated speed.'

This constant reciprocation of the presser proper 4at the base of the hopper keeps the sticks of wood in the lower portion of the latter in motion, without subjecting themto the pressure of the ram, andthus prevents jamming lin the hopper. Upon t-he movement of the presser away from the grinder, therefore fresh wood automatically falls from the `hopper b into the press, thus. rendering superfluous the attendance at each press of workmen to reverse the empty presses and fill them again by hand. Consequently, since the operator only has to take care that a sufficient quantity of wood is in the large stationary hopper b, a single work-y man can attend to a relatively large number of grinders and at the same time preserve the same in uninterrupted operation. Furthermore, by reason of the fact that each press is again filled very rapidly and comes quickly into action again, the power eml .cated .pressing.plates a', each being driven the piston ofjahydrauhccylmder d. By

ployed is more uniform -and is thereforel more easily governed than when each press means of a box ZJ shaped in its upper part arevmade adjustable toward the grindstone by any suitable means and when the stone wears are adjusted correspondingly.

In the form represented in Fig. 2 the pressing plates aare pivoted tothe bottom portion of the hopper b, which is lled with wood by a conveyer p for example. The wood is guided by the adjustable plates g, g

which are shaped concentrically to the centers of the pressing-plates a. The rest of the machine is t-he same as in Fig. l.

A modiiedform of the machine shown in Fig. l is represented in Fig.' 3 where several small presses a are arranged around one common grindstone c.

haue separated hoppers or a common hopper. The guide plates g are made ad-Y justable here also. In Fig. 4: is illustrated a grinder with a in Fig. 2. The rocking pressing-plate a reciprocated by means of the piston of a hydraulic cylinder Z is pivoted below the grindstonec with its center on the lower 30.edge of the hopper b. In vorder to load the driving motor uniformly two such presses may be vplaced beside one another lengthwise of a single grindstone or bearing against two narrow stones mounted on the A reversed and filled.

In the form shown in Fig. 5 the pressingplate is substituted by an elastic' steel beltv a2, one end of which is attached to the adjustable plate g, the other end being guided over a roller or cylinder z' arranged at the lower end of the hopper Z) and attached to a hydraulic cylinder d for `which can be substituted a weight or the like. By tensioning or relaxing the steel belt the pressing-chamber is made smaller or larger, and when made larger fills automatically from the'hopper b. y

, In the form shown in Fig. 6 the pressing plate a is pivoted to the base f of the machine instead of the bottom portion of the hopper Z7 as in Fig. 2. The pressing plate a through the slotted middle .part of which enters an extension g" of the adjustable plate g is driven by the piston of a hydraulic cylinder (Z. A similar press mechanism may be reversely arranged on the other side' of the grindstone. 6 In the modified form of the machine shown in Fig. 7 the pressing room a is formed within a' vertical guide 7L which is open below and above and is adjustable t oward the grindstone c. In this guide moves the vertically reciprocating pressing-box 'pressing faces a These presses may single large pivoted press-of the kind shown same shaft, the two presses to be alternately la" which embraces or is guided at its upper end bythe chute bforming the lower part ofthe hopper.` The lower part ofthe-press-` ing-box af. diminishes in diameter from4 belowto the top in order toreceive inclined which are preferably roughened for the purpose. of securing' av 'proper grip of the wood and pressing it effectually toward the grind-stone c. Several of the presses described may perferably be combined to one machine. The moving of the pressing-boxes a may be eifected ina suitable manner, for example by the piston of a hydraulic cylinder. When the pressingsbox risesthe wood advances auto-- matically to the pressing-room so that also 80 in this case the feed ofthe material to the grind-stone can be looked upon as continuous during the entire operation of the machine. y

Besides the constructional forms shown in "g5 the drawings further forms can, of course, be made, all wood grinders whos'epressingchambers ll again automatically with wood after being emptied and the real pressing device being reversed or returned int-o its commencing position automatically or by hand falling within the scope of the' invention. The wood maybe supplied continuously or periodically to the hopper.

I claim as my inven ion:

1. A wood pulp grinding machine gomif prising a grinding member, a presser member for forcing a charge of wood against the grinder, a reciprocating, fluid-'operated motor operatively connected to said. presser member for impartinga positive back and Y forth motion thereto whereby the -presser member may, be advanced slowly. under heavy pressure during grinding and rapidly retreated to receive a fresh charge,com 105 bination with a. sup'erposed, stationary recharging hopper of sufficient size to hold a multiplicity of charges, said hopper vopening to and automatically discharging byv gravity to the space between the grinder and the presser on the retreat of the latter and holding a quantity of woodsufcient to prevent the escape ofthe wood from the I space between the grinder and the presser during the advance of the latter, substan= tially as described.

f 2. A wood pulp grinding machine comprising a grinding member, a presser mem- A ber for 'forcing a chargeof wood against the grinder, meansforpositively-` advancing and 12.0

retreating said presser, vin combination with a superposed stationary hopper of suflclentsize`to hold a multiplicity of charges, the upper surface of saidv presser partially sustaining the reserve of Wood in'the hopper -125 above the same'during its advance, andthe acting face of the presser being formed to coperate with the weight of the reserve of wood in the hopper ,to prevent the upward 'escape of the charge-from the PlSSel? Chm- 130 ber during lthe advance of the presser for grinding.

3. A Wood pulp'grinding machine oomprising a grinding member, a presser member for forcing a charge of wood against the grinder, means for positively advancing and retreating said presser, in combination with a superposed stationary hopper of suioient size to hold a multiplicity of charges, the upper surface of said presser partially sustaining the reserveof Wood in the hopper .abovethe same during its advance, but permitting a suceeding charge to fall by gravity into the space between the presse-and the grinder on theretreat of the presser, 15 Substantially as described.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses.

PAUL PRIEM.

Witnesses:

' W. HELLER, O. BOLDT. 

